Study on the Movement Law of Overlying Strata in Underground Mining with Nonlinear Elastic Foundation Beam
Received date: 2024-04-08
Revised date: 2024-05-10
Online published: 2024-08-27
In the extraction of overlying orebodies in complex environments，it is imperative to prioritize safety and efficiency while preserving the stability of rock strata to prevent surface collapse and safeguard structures.To accomplish these objectives，it is essential to develop effective strategies for managing rock strata movement by comprehensively assessing the impact of underground backfill mining.An initial study was conducted on the impact of various mining field structural parameters，including roof thickness，original rock stress，and backfill ratio，on overlying rock movement at the Panlong lead-zinc mine.This analysis utilized a nonlinear elastic foundation beam mechanical model.Subsequent numerical simulations were performed to determine overlying rock movement values under varying backfill ratios.The results were compared to those obtained from the mechanical model，revealing differences ranging from 3% to 9%，thus validating the reliability of the mechanical model’s results.A ground mine backfill mining technology for controlling settlement of overlying rock was proposed and implemented in industrial experiments.Research findings suggest that the primary factors influencing overlying rock movement，in order of significance，are the backfill ratio，structural parameters of the mining field，roof thickness，and original rock stress.Increasing the backfill ratio is crucial for managing overlying rock displacement，while adjusting anchor support spacing and backfill ratio according to the mining field structure are effective methods for controlling overlying rock displacement.
Xiangrui HE , Xianyang QIU , Xiuzhi SHI , Xiaoyuan LI , Wei ZHI , Jun LIU , Yuanlai WANG . Study on the Movement Law of Overlying Strata in Underground Mining with Nonlinear Elastic Foundation Beam[J]. Gold Science and Technology, 2024 , 32(4) : 640 -653 . DOI: 10.11872/j.issn.1005-2518.2024.04.097
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